The word "onicolo" is spelled /əˈnɪkəloʊ/. The first syllable is pronounced with a schwa sound followed by the letter "n" and a short "i" sound. The second syllable starts with a "k" sound followed by a long "o" sound and ends with the letters "l" and "o". The spelling of "onicolo" may seem unusual or unfamiliar to some, but it is a valid word in the English language, meaning "a small swelling or nodule."
A variety of onyx with a deep-brown ground, on which is a band of bluish white, used for making cameos.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.